AT command UART connection to ESP32 and Modem
Posted: Wed Apr 21, 2021 2:21 am
Hello,
I am trying to connect the ESP32-WROOM-32UE to a Quectel BG95 LTE module. I am using a UART connection to send AT commands as follows:
ESP TXD0 to Quectel RXD0
ESP RXD0 ro Quectel TXD0
ESP GPIO15 (RTS) to Quectel CTS
ESP GPIO14 (CTS) to Quectel RTS
But the hardware integration module of the LTE modem has the image below, which includes connecting DTR, DCD, and RI. Are these necessary for sending AT commands? If so what GPIOs on the ESP would this correspond to?
I am trying to connect the ESP32-WROOM-32UE to a Quectel BG95 LTE module. I am using a UART connection to send AT commands as follows:
ESP TXD0 to Quectel RXD0
ESP RXD0 ro Quectel TXD0
ESP GPIO15 (RTS) to Quectel CTS
ESP GPIO14 (CTS) to Quectel RTS
But the hardware integration module of the LTE modem has the image below, which includes connecting DTR, DCD, and RI. Are these necessary for sending AT commands? If so what GPIOs on the ESP would this correspond to?